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i know the formula to be used but having trouble identifying factors to plug in. Please set up equation so I can see where things go.

need help with these two problems. i know the formula to be used but having trouble identifying factors to plug in.  Please set up equation so I can see where things go.
1. Calculate the force of gravity betwen the earth(mass - 6.0 x 10 to the 24th  kg) and the moon (mass = 7.4 x 10 to the 22 powerkg)  The average earth distance is 3.8 x 10 to the 8th powerm.
2. Calculate the force of gravity between a new born baby of mass 4 kg and the obstetrician of mass 75kg, who is 0.3 m from the baby.
3.  Calculate the force of gravity on a l kg mass at the earths surface. Tha mass of earth is 6 x 10 to the 24 power and its radius is 6.4 x 10 to the 9th power.

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